Jump to content


Photo

Creating hard and sharp shadows.


  • Please log in to reply
4 replies to this topic

#1 Andy_Alderslade

Andy_Alderslade
  • Basic Members
  • PipPipPipPip
  • 1055 posts
  • Cinematographer
  • London, UK

Posted 17 April 2010 - 04:04 PM

Hi, I'm shooting a project next week where we will need a 'shadow puppet' affect to appear on the far wall of a room which will be approximately 20' wide.

Now considering that the projected subject, like a hand or a puppet has to be out of shot but will throw a softer shadow when closer to the light source is there any ways of 'resharpening' the shadow say with a lens?

Thanks,
Andy
  • 0

#2 John Sprung

John Sprung
  • Sustaining Members
  • 4635 posts
  • Other

Posted 17 April 2010 - 04:31 PM

What I've done in the past is to use a bare bulb source far away. I got an old mogul bipost socket and just made a mount to put it on a baby stand, with a 2K quartz lamp in it. Set a few flags around it to cut down on the bounce, and you can get light that's even harder than the sun.



-- J.S.
  • 0

#3 Alex Malm

Alex Malm
  • Basic Members
  • PipPip
  • 15 posts
  • Student
  • Chicago, IL

Posted 17 April 2010 - 05:02 PM

You could open the front of a fresnel so as to avoid using the lens. And set it to flood. If I'm not mistaken the flood setting on a fresnel creates fairly hard shadows.
  • 0

#4 Dominic Case

Dominic Case
  • Basic Members
  • PipPipPipPip
  • 1357 posts
  • Other
  • Sydney Australia

Posted 17 April 2010 - 08:58 PM

The amount of blur (which is really circle of confusion projected the other way) is equal to the diameter of the light source, times the distance from puppet to wall, divided by the distance from puppet to light source.

So the further away the light source is from the puppet, the better. And the smaller the light source (or lens in front of it) the better.

Have you considered using a slide projector as your light source?

Alternatively, how big is your puppet? Can you use it horizontally over the surface of an old overhead projector (the sort used to project full page size transparencies?) Or re-rig one of those to have a vertical light plane?
  • 0

#5 Andy_Alderslade

Andy_Alderslade
  • Basic Members
  • PipPipPipPip
  • 1055 posts
  • Cinematographer
  • London, UK

Posted 18 April 2010 - 01:35 PM

Hi, thanks for all the excellent replies, all have their own advantages and I'll have to test which ones are most suitable.

Hi Dominic, I literally dreamt of using a slide-projector last night and tried both my slide-projector and super 8 projector this morning, the slide projector was bright and very sharp, though the cine-projector was sharper but obviously has a rotating shutter that may cause some problems.

I never thought of an old overhead projector - I completely forgot they once existed! Lets hope I can still locate one.

Many thanks,
Andy
  • 0


Rig Wheels Passport

Ritter Battery

Paralinx LLC

CineTape

Abel Cine

rebotnix Technologies

New Pro Video - New and Used Equipment

Aerial Filmworks

Glidecam

Technodolly

Broadcast Solutions Inc

Wooden Camera

Gamma Ray Digital Inc

CineLab

FJS International, LLC

The Slider

Tai Audio

Media Blackout - Custom Cables and AKS

Metropolis Post

Willys Widgets

Visual Products

FJS International, LLC

Glidecam

Visual Products

Willys Widgets

Technodolly

Aerial Filmworks

CineLab

Ritter Battery

Gamma Ray Digital Inc

Wooden Camera

rebotnix Technologies

Tai Audio

Paralinx LLC

New Pro Video - New and Used Equipment

Metropolis Post

Media Blackout - Custom Cables and AKS

Broadcast Solutions Inc

Abel Cine

Rig Wheels Passport

CineTape

The Slider